filterbar: Add support to match case and glob patterns for the filter bar

Currently, Dolphin's filter bar defaults to plain text, but it actually has a hidden regex functionality too: it tries to auto-detect and switch to a regular expression if characters like '*', '?', or '[' are present in the search string.
This approach has a couple of issues. First, the regex/wildcard functionality is completely hidden from the user. Second, the auto-detection is flawed because those are perfectly valid characters in Linux filenames. If a user tries to filter for a file literally named [draft].txt, the auto-switching kicks in and causes unexpected behavior.

This MR fixes this by making the filtering modes explicit through a ComboBox at the side of the filter bar, with the options 'Plain Text', 'Glob' and 'Regular Expression'. It also adds a button to toggle the case sensitive matching. A visual feedback for when the user is inputting an invalid expression has also been implemented by turning the bar background red and making appear an error symbol.

1 files changed, 13 insertions, 0 deletions

diff --git a/src/views/dolphinview.h b/src/views/dolphinview.h
index 67233b668..6aa5b595d 100644
--- a/src/views/dolphinview.h
+++ b/src/views/dolphinview.h
@@ -10,6 +10,7 @@
 
 #include "dolphin_export.h"
 #include "dolphintabwidget.h"
+#include "kitemviews/private/kfileitemmodelfilter.h"
 #include "tooltips/tooltipmanager.h"
 
 #include "config-dolphin.h"
@@ -277,6 +278,18 @@ public:
     QStringList mimeTypeFilters() const;
 
     /**
+     * Sets the filtering mode of the currently used nameFilter.
+     */
+    void setFilterMode(KFileItemModelFilter::FilterMode mode);
+    KFileItemModelFilter::FilterMode filterMode() const;
+
+    /**
+     * Enables or disable the caseSensitive matching of the currently used nameFilter.
+     */
+    void setFilterCaseSensitive(bool caseSensitive);
+    bool isFilterCaseSensitive() const;
+
+    /**
      * Tells the view to generate an updated status bar text. The result
      * is returned through the statusBarTextChanged(QString statusBarText) signal.
      * It will carry a textual representation of the state of the current