GitLab

Fixes #10354

Handling of SHIFT + PAGE_UP/PAGE_DOWN was missing in the
ConversationTextview key press handler

- Disable horizontal scrollbar so the treeview expands
- Ellipsize values after 40 chars
- Add row tooltip if entries were ellipsized

So we can test ellipsizing and the tooltip

So we can see a scrollbar

Fixes #10339.

If a user called bin/Gajim.exe directly config_path parameter was ignored,
which could lead to problems with non-portable user settings.

Fixes #10337

Fixes #10326

Fixes #10327