All-in-one PR including #46 #47 #50 #51 #52

[sphh]

Hi Jonathan @protz ,

What started as a tiny exercise to sort out the insertion of complex LaTeX turned out to become a bit more elaborated. My first idea was to keep them all separated to help in cherry picking the PRs you like, but I am not sure if I managed to keep them really separate. I might have missed one or two diffs (but I do not hope so). So here comes the all-in-one PR including #46 #47 #50 #51 #52. Feel free to use this one or any of the others. And thanks for starting this wonderful add-on!

Here is an overview of all the changes:

• Increased version to 0.7.1.
• Fixed the insertion of complex LaTeX (Bug #43).
• Select the insertion marker when opening the insert complex LaTeX dialog.
• Cleaned up the options dialog.
• Replaced place holder __REPLACEME__ with __REPLACE_ME__, which IMHO is easier to the eye.
• Added alignment of inserted pictures to the text baseline (Bug #36).
• Added improvements of LaTeXIt! button:
  • Button is disabled for plain text composer windows (Bug #48).
  • Middle click calls 'undo' (Bug #2).
  • Shift+middle click calls 'undo_all'.
• Added context menu to composer window (Bug #49).
• Added LaTeXIt! to the Add-ons menu to access the preferences (Bug #42).
• Removed the configuration item from toolbar and context menus, because they are not needed anymore.
• Delete all cached images when the composer window is closed (Bug #44).
• Added autoscaling of images to font size (can be switched off in the preferences, where a size can be manually set).
• When inserting a complex LaTeX, the size can either be automatically calculated from the surrounding text or set manually.
• Use 'font size' (in px) instead of 'resolution'.

[sphh]

Well, this became a bit of a mess keeping the 5 PRs separate, because they started to have an impact on each other. On the other hand I was not sure, if you like all of them, so I kept them separate for you to choose.

Do you think, it's possible to revert the PR #46, which is already merged? That should help applying this PR cleanly.

I will also update this PR with the notes from https://github.com/protz/LatexIt/pull/50#discussion_r450332110 and https://github.com/protz/LatexIt/pull/51#discussion_r450333143 (Please can you comment on https://github.com/protz/LatexIt/pull/51#discussion_r450382284. Thanks!)

What is your opinion about https://github.com/protz/LatexIt/pull/46#issuecomment-608092034? If I am at it, I could change it.

[protz]

I've forced-push to forget the merge of the previous PR, so now you should be able to combine everything into this PR, then I'll merge this one, followed by #54

[sphh]

Thanks for reverting #46! That helped really a lot!!