Centering next difference

[AlexL]

Hello.

I compare files, and press <F7> several times. As required, EDP each time shows next difference. This way I reached some difference that takes, say 20 lines (which is ~1/3 of the panel height in my case). I see that according to the centering option EDP positions the difference at the center of the screen; to say more exactly, it positions the first line of the difference at the center of the screen. But do I want such centering, or other centering? I'm not sure, but probably it would be better to center the middle of the difference fragment, and not its first line. Otherwise you don't see where the difference fragment finishes, and feel uncomfortable. Unless you have passed through this difference several times today, you instinctively scroll the window in order to see what this different fragment is about. Why not to automate this action?

I don't know if all users will like this, so probably such automation needs optional behavior.

Of course, this approach requires taking into account several things:
1) Don't scroll too much trying to combine center of the difference with the center of the screen: leave at least one line that does not belong to this fragment at the top of the screen.
2) What to do when window size changes as a result of manual window resize? Should we scroll the panels in order to fulfill (1) or not? The currently existing approach does not scroll in this case.
3) The bottom of very long difference still won't be visible, and this is OK.
4) Probably not to perform this action (and gray out its option, if any) if "Scroll current diff to center" is off.

Thank you.

[psguru]

The way currently works is as follows:

1. If "Scroll current diff to center" option is enabled, the first line of destination difference (next or previous, depending on what command is used) will be scrolled to the center of the pane.
2. If "Scroll current diff to center" option is disabled:
a) If the first line of the destination diff is visible on the pane, no scrolling occurs.
b) Otherwise, the first line of destination difference will be scrolled to the center of the pane

So perhaps a better approach would be to leave the "Scroll current diff to center" behavior as it is now but to change the non-"Scroll current diff to center" behavior b) so that the first line of destination difference will be scrolled to the [top + 1 line] position, so that the difference will be shown as much as possible.

[AlexL]

The way currently works is as follows:

1. If "Scroll current diff to center" option is enabled, the first line of destination difference (next or previous, depending on what command is used) will be scrolled to the center of the pane.
2. If "Scroll current diff to center" option is disabled:
a) If the first line of the destination diff is visible on the pane, no scrolling occurs.
b) Otherwise, the first line of destination difference will be scrolled to the center of the pane

So perhaps a better approach would be to leave the "Scroll current diff to center" behavior as it is now but to change the non-"Scroll current diff to center" behavior b) so that the first line of destination difference will be scrolled to the [top + 1 line] position, so that the difference will be shown as much as possible.

I'm not sure you are right. In your case such difference that has a height of one line, will jump to the top of screen (minus one line), which is probably not desirable. What I suggested is an option, when the first line of difference won't be taken into account at all, and only the middle line will control positioning (excluding case of long fragments, where we should show the first line anyway at the "top+1" line).

Thank you.

[psguru]

OK, I see your point. But why another option? As we both agree, centering a diff is really making sure that the whole diff is centered -- if possible. If not, we'll do our best and put the first line of the diff to the top + 1 position. I think all users will benefit from such interpretation of "Scroll current diff to center" option. Please can preview this new behavior at http://www.prestosoft.com/download/ed34preview.zip

[AlexL]

OK, I see your point. But why another option? As we both agree, centering a diff is really making sure that the whole diff is centered -- if possible. If not, we'll do our best and put the first line of the diff to the top + 1 position. I think all users will benefit from such interpretation of "Scroll current diff to center" option. Please can preview this new behavior at http://www.prestosoft.com/download/ed34preview.zip

You made exactly what I suggested; thank you.

I simply was not sure that all users will have the same private preference as me, that's why I suggested probable option for them. But as for me - all is perfect (except the speed; but this is another thread).

[AlexL]

Hello.

Let's suppose I have a file with 200 lines, and each line consists of text "Line 1" only (means all lines are the same). Let's assume I have second file with the same contents except line #100, which is "Line 2".

Comparing these two files (no ignores) gives us proper comparison panels except the fact that the different line is almost at the top of panels ("almost" means it is second line that appears on the screen). Is this intended? I expected this different line to be at the center of the screen. "Scroll current diff to center" does not help, it only changes location of the different line from line #1 to line #2 (from the top of the screen).

Thank you.

[psguru]

I actually cannot reproduce this behavior. Could you post your options here, preferably for 4.0? You also may want to check "After new compare scroll vertically to" option under Options | Misc.

[AlexL]

Long common lines are replaced by "...":

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10::App="D:\Program Files\ExamDiff Pro\Plug-Ins\cURL\curl.exe"
10::Args=-s -o $OUTPUTFILEPATH $INPUTFILEPATH
10::Description=Fetch Remote File [installed]
10::UseExitCode=0
10::Enabled=1
10::ExitCode=0
11::App="C:\WINDOWS\system32\cscript.exe"
11::Args=...
11::Description=Fetch Remote Directory [installed]
11::UseExitCode=0
11::Enabled=1
11::ExitCode=0
12::App="D:\Program Files\ExamDiff Pro\Plug-Ins\Info-ZIP\Unzip\unzip.exe"
12::Args=$INPUTFILEPATH -d$OUTPUTFILEPATH
12::Description=Unzip [installed]
12::UseExitCode=1
12::Enabled=1
12::ExitCode=0
13::App="D:\Program Files\ExamDiff Pro\Plug-Ins\PESnoop\PESnoop.exe"
13::Args=$INPUTFILEPATH /PE_ALL
13::Description=Dump PE32 [installed]
13::UseExitCode=0
13::Enabled=1
13::ExitCode=0
14::App="C:\WINDOWS\system32\sort.exe"
14::Args=$INPUTFILEPATH
14::Description=Sort [installed]
14::UseExitCode=0
14::Enabled=0
14::ExitCode=0
Use plug-ins=1
Use plug-ins for directories=1
[Binary]
Bytes per line=16
Fit to window=0
Byte format=0
Byte case=0
Editor hex=
Arguments=$FILE
Block size=1
EBCDIC=0
Show control chars=0
Show extended chars=1
[HTML]
Vert HTML Template hex=C:\PROGRAM FILES\EXAMDIFF PRO\difftempl_v.htm
Horz HTML Template hex=C:\PROGRAM FILES\EXAMDIFF PRO\difftempl_v.htm
Use JavaScript=1
[Global - General]
Shell integration=1
Allow appending files to dirs=0
Shell options=
AutoPick=1
Autopick limit=100
Recent sessions=4
Recent session files=4
Retain session pairs=0
[Keyboard]
Keys=...

The "After new compare scroll vertically to" option is set to "First difference".

This is what I see:
http://img489.imageshack.us/img489/986/ ... lemaf9.jpg

[psguru]

This appears to a (minor) bug. It will be fixed in the next build of 4.0 Beta. The reason I couldn't reproduce the problem is that it only appears if you use "Minimize when Compare New Pair" option.