Bug#834141: Visually show when there are changes in a line that require horizontal scrolling to be seen

[Enrico Zini]

Package: meld
Version: 3.16.2-1
Severity: wishlist

Hello,

I recently had to review some code written for large terminals and
formatted in a way that makes heavy use of vertical alignment.

Looking at differences with meld, I was never sure whether I could see
all the differences, or whether I was missing something at the right
side of the screen, so I spent some effort in scrolling right and left.

This made me wish for meld to somehow visually distinguish whether the
rest of the line that would require right-scrolling to be seen is
unchanged, or whether it does have changes.

I'm attaching two example files that can be compared side by side, and
unless meld is run on a very wide window, example1.c would have a rather
significant change that could currently be easy to miss.


Enrico

-- System Information:
Debian Release: stretch/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.6.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages meld depends on:
ii  dconf-gsettings-backend [gsettings-backend]  0.26.0-1
ii  gir1.2-gtksource-3.0                         3.20.4-1
ii  libcanberra-gtk3-module                      0.30-3
ii  libgtk-3-0                                   3.20.6-2
ii  libgtksourceview-3.0-1                       3.20.4-1
ii  patch                                        2.7.5-1
ii  python-gi                                    3.20.1-1
ii  python-gi-cairo                              3.20.1-1
pn  python:any                                   <none>

Versions of packages meld recommends:
ii  yelp  3.20.1-1

meld suggests no packages.

-- no debconf information
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