D6917: [Component Chooser] Add ComboBox with browsers

[Kai Uwe Broulik]

broulik created this revision.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

REVISION SUMMARY
  This makes the dialog more user-friendly by providing a ComboBox with applications that can handle text/html (typically web browsers) instead of only providing a "guess contents" and "custom command" text field.

TEST PLAN
  Before
  F3820514: Screenshot_20170726_115838.png <https://phabricator.kde.org/F3820514>
  After
  F3820515: Screenshot_20170726_115921.png <https://phabricator.kde.org/F3820515>
  
  Verified that:
  
  - Checking "in an application based on contents" removes the BrowserApplication from kdeglobals
  - Selecting an application from the combo is properly saved and restored
  - Entering a custom command is properly saved and restored
  - When choosing a custom application (`...` button) but it is listed in the combobox, the "in the following application" is checked and the appropriate entry in the ComboBox selected
  - clicking links in KDE apps actually open in the desired application

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D6917

AFFECTED FILES
  kcms/componentchooser/browserconfig_ui.ui
  kcms/componentchooser/componentchooserbrowser.cpp

To: broulik, #plasma, #vdg, dfaure
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart, lukas
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