Squish: Ensure text cursor has safe position

When re-opening a file that had been opened and closed inside
the current active session we open the file at the last used
editor position.
Provide a function to explicitly jump to the first line of an
editor.

Change-Id: I0602d8ef46e80a20385fd1b205812776d6666326
Reviewed-by: Robert Loehning <robert.loehning@qt.io>

tests/system/shared/editor_utils.py

@@ -23,6 +23,10 @@
 #
 ############################################################################
 
+def jumpToFirstLine(editor):
+    home = "<Home>" if platform.system() == 'Darwin' else "<Ctrl+Home>"
+    type(editor, home)
+
 # places the cursor inside the given editor into the given line
 # (leading and trailing whitespaces are ignored!)
 # and goes to the end of the line
@@ -36,10 +40,7 @@ def placeCursorToLine(editor, line, isRegex=False):
     if not isinstance(editor, (str, unicode)):
         editor = objectMap.realName(editor)
     oldPosition = 0
-    if isDarwin:
-        type(getEditor(), "<Home>")
-    else:
-        type(getEditor(), "<Ctrl+Home>")
+    jumpToFirstLine(getEditor())
     found = False
     if isRegex:
         regex = re.compile(line)

tests/system/suite_editors/tst_basic_cpp_support/test.py

@@ -85,10 +85,7 @@ def main():
     if not waitFor("str(mainWin.windowTitle).startswith('dummy.cpp ') and ' @ cplusplus-tools ' in str(mainWin.windowTitle)", 5000):
         test.warning("Opening dummy.cpp seems to have failed")
     # Reset cursor to the start of the document
-    if platform.system() == 'Darwin':
-        type(cppwindow, "<Home>")
-    else:
-        type(cppwindow, "<Ctrl+Home>")
+    jumpToFirstLine(cppwindow)
 
     type(cppwindow, "<Ctrl+f>")
     clickButton(waitForObject(":*Qt Creator_Utils::IconButton"))

tests/system/suite_tools/tst_codepasting/test.py

@@ -76,7 +76,7 @@ def pasteFile(sourceFile, protocol):
     invokeMenuItem("File", "Open File or Project...")
     selectFromFileDialog(sourceFile)
     editor = waitForObject(":Qt Creator_CppEditor::Internal::CPPEditorWidget")
-    type(editor, "<Up>")
+    jumpToFirstLine(editor)
     typeLines(editor, "// tst_codepasting %s" % datetime.utcnow())
     sourceText = editor.plainText
     invokeMenuItem("Tools", "Code Pasting", "Paste Snippet...")
@@ -232,6 +232,7 @@ def main():
     invokeMenuItem("File", "Open File or Project...")
     selectFromFileDialog(sourceFile)
     editor = waitForObject(":Qt Creator_CppEditor::Internal::CPPEditorWidget")
+    jumpToFirstLine(editor)
     markText(editor, "Down", 7)
     # QString QTextCursor::selectedText () const:
     # "Note: If the selection obtained from an editor spans a line break, the text will contain a