- Use source url
- Drop conditionals for older distros, they fail to build anyways
- Use spec-cleaner to modernise spec file

- Update to version 2.12.10
* bug fixes
* fix structure view with Qt >5.10
- Update to version 2.12.8
* improved tokenizer for syntax checking and completion
* pressing Ctrl+F while the editor search has focus opens the
extended search, i.e., you'll get extended search by pressing
Ctrl+F twice
* automatically insert math delimiters ($) when inserting a math
command outside of a math env (can be turned off, default on)
* change copy behavior of multiple cursors from selection order
to line order
* file list is now a transparent popup window: closes when clicked
outside
* combine file conflict and show diff dialog
* fix file watcher not recognizing multiple changes to a file in
quick succession
* improved detection of package names when opening texdoc
* new symbol panel layout
* some touch scrolling on certain panels
* updated synctex and poppler libraries for pdf viewer
* fix undo when a snippet is inserted and a selection is inserted
as well
* fix some parts of the editor background may not be drawn in the
correct color
* build for OSX High Sierra