D8385: Set the columns in "Overview" mode to match the amount of pages if document is small

[Lex Dem]

lexdem created this revision.
lexdem added a reviewer: Okular.
lexdem added a project: Okular.

REVISION SUMMARY
  This is a patch for the following request: 355283
  
  The principle is simple. User toggles the checkbox, which enables overriding the default columns for Overview mode, if the document is small. For example, if document has 1 or 2 pages and the default columns in Okular settings is 3, Overview mode will enable 1 or 2 columns for better UX

REPOSITORY
  R223 Okular

REVISION DETAIL
  https://phabricator.kde.org/D8385

AFFECTED FILES
  conf/dlggeneralbase.ui
  conf/okular.kcfg
  ui/pageview.cpp

To: lexdem, #okular
Cc: aacid
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