Picture filter expression editor

Expression editor is used to create picture filter expressions in PhoA: for Expression search and in View properties.

Detailed description of picture filter expression language) is given here.

Controls

New	Clears the expression editor contents.
Open...	Displays the standard File open dialog which allows you to load text of expression from a file saved before. The dropdown arrow button displays the MRU (most recently used) file list.
Save as...	Displays the standard File save dialog allowing to select a file to write the current expression to.
Insert property	Displays a menu containing the list of available picture properties. When you select an item, property text is inserted at the current caret position in the expression editor.
Insert operator	Displays a menu containing the list of available operators. When you select an item, operator text is inserted at the current caret position in the expression editor.
Cut	Cuts text currently selected in the expression editor, to the clipboard.
Copy	Copies text currently selected in the expression editor, to the clipboard.
Paste	Pastes text from the clipboard into the expression editor.
Undo	Rolls back the last change made in the expression editor.
Redo	Redoes the last misundone change.
Syntax check	Performs the syntax check of the entered expression and displays a message saying about check results.

The same commands are available in the expression editor context menu displayed by a mouse right click or using Shift+F10 keys.