Add EXCLUDED_FILES variable

When adding source files to the _FILES variables conditionally
those are so far not being formatted or translated. Adding
these files at least to the EXCLUDED_FILES will fix this.

Replaces DOC_ONLY_FILES which served the same purpose but was
limited to documentation.

cmake/modules/BasicConfig.cmake

@@ -274,7 +274,8 @@ set(FORMATABLE_FILES
     ${WIDGETS_HEADER_FILES}
     ${WIDGETS_SRC_FILES}
     ${QML_HEADER_FILES}
-    ${QML_SRC_FILES})
+    ${QML_SRC_FILES}
+    ${EXCLUDED_FILES})
 # only format C/C++ files (and not eg. QML files)
 if (FORMATABLE_FILES)
     list(FILTER

cmake/modules/Doxygen.cmake

@@ -44,8 +44,8 @@ set(DOXY_INPUT_FILES
     ${WIDGETS_SRC_FILES}
     ${QML_HEADER_FILES}
     ${QML_SRC_FILES}
-    ${DOC_FILES}
-    ${DOC_ONLY_FILES})
+    ${EXCLUDED_FILES}
+    ${DOC_FILES})
 set(DOXY_PATH_PREFIX "${CMAKE_CURRENT_SOURCE_DIR}/")
 list(GET DOC_FILES 0 DOXY_MAIN_PAGE_FILE)
 set(DOXY_MAIN_PAGE_FILE "${DOXY_PATH_PREFIX}${DOXY_MAIN_PAGE_FILE}")

doc/buildvariables.md

@@ -227,9 +227,13 @@ and qtutilities.
   only required for Qt Widgets GUI
 * `QML_HEADER_FILES`/`QML_SRC_FILES`/`QML_RES_FILES`: specifies C++
   header/source files and Qt resouce files only required for Qt Quick GUI
+* `EXCLUDED_FILES`: specifies C++ files which are part of the project (and therefore
+  should be formatted by the `tidy` target, added to the documentation and considered
+  for translations) but are excluded from the actual build; when adding files
+  conditionally to the other `_FILES` variables, be sure to add them at least
+  to `EXCLUDED_FILES`
 * `DOC_FILES`: additional markdown files to be inlcuded in the documentation
   created via Doxygen; the first file is used as the main page
-* `DOC_ONLY_FILES`: specifies documentation-only files
 * `REQUIRED_ICONS`: names of the icons required by the application and the
   used libraries (can be generated with
   [findicons](https://github.com/Martchus/findicons))