Far simpler implementation of back word.

This fixes many problems that back word was having when using the
gotoPreviousWord function. Back word will now not get stuck when the
current line starts with whitespace. It will also now not skip over some
of the words that start on the beginning of the line. It will stop going
back when it hits an empty line like in vim. It will also skip over
lines that only have whitespace (just like vim).

src/vibreoffice.vbs

@@ -977,26 +977,25 @@ Function ProcessMovementKey(keyChar, Optional bExpand, Optional keyModifiers)
     ElseIf keyChar = "w" or keyChar = "W" Then
         oTextCursor.gotoNextWord(bExpand)
     ElseIf keyChar = "b" or keyChar = "B" Then
-        ' If the oTextCursor.gotoPreviousWord didn't move the cursor then the 
-        ' current line starts with whitespace or it is the first word on the 
-        ' first line. If the former is true then move the cursor to the end of 
-        ' the above line. If the above line is not empty and the cursor is not 
-        ' already on the start of a word then go to the previous word.
-        If NOT oTextCursor.gotoPreviousWord(bExpand) And getCursor().goUp(1, bExpand) Then
-                ' If the line is not empty
-                If NOT (getCursor().isAtStartOfLine() And getCursor().isAtEndOfLine()) Then
-                    getCursor().gotoEndOfLine(bExpand)
-                    ' Apply changes above to oTextCursor
-                    oTextCursor = getTextCursor()
-                    ' If the cursor is not already on the start of a word 
-                    ' then go back one word
-                    If NOT oTextCursor.isStartOfWord() Then
-                        oTextCursor.gotoPreviousWord(bExpand)
-                    End If
-                Else
-                    bSetCursor = False
-                End If
-        End If
+        ' The function gotoPreviousWord causes a lot of problems. The 
+        ' following method doesn't have to account for as many special cases.
+
+        ' Move cursor to left in case cursor is already at the start of a word 
+        ' or is already on an empty line.
+        oTextCursor.goLeft(1, bExpand)
+        getCursor().goLeft(1, bExpand)
+
+        ' Move cursor left to the start of previous word or until it hits an 
+        ' empty line or until it can't move left anymore (reaches first line). 
+        ' gotoStartOfWord gets stuck sometimes so manually moving the cursor 
+        ' left is necessary in these cases.
+        Do Until oTextCursor.gotoStartOfWord(bExpand) Or (getCursor().isAtStartOfLine() And getCursor().isAtEndOfLine())
+            ' If cursor can no longer move left then break loop
+            If NOT oTextCursor.goLeft(1, bExpand) Then
+                Exit Do
+            End If
+            getCursor().goLeft(1, bExpand)
+        Loop
 
     ElseIf keyChar = "e" Then
         If oTextCursor.isEndOfWord(bExpand) Then