Modernized progress window GUI

Following the refactoring that has been initiated in pdfmasher's
"vala" branch, I pushed more progress window logic into the
core.

The UI code is now a bit dumber than it used to be, and the core
now directly decides when the progress window is shown and
hidden. The "job finished" notification is also directly sent by the
core. Job description update logic is handled by a core gui
textfield.

Job description contsants also moved to the core, triggering
a localisation migration from "ui" to "core".

cocoalib/cocoa/__init__.py

@@ -16,19 +16,14 @@ from .CocoaProxy import CocoaProxy
 
 proxy = CocoaProxy()
 
-try:
-    from jobprogress.performer import ThreadedJobPerformer as ThreadedJobPerformerBase
-    class ThreadedJobPerformer(ThreadedJobPerformerBase):
-        def _async_run(self, *args):
-            proxy.createPool()
-            try:
-                ThreadedJobPerformerBase._async_run(self, *args)
-            finally:
-                proxy.destroyPool()
-except ImportError:
-    # jobprogress isn't used in all HS apps
-    pass
-
+def autoreleasepool(func):
+    def wrapper(*args, **kwargs):
+        proxy.createPool()
+        try:
+            func(*args, **kwargs)
+        finally:
+            proxy.destroyPool()
+    return wrapper
 
 def as_fetch(as_list, as_type, step_size=1000):
     """When fetching items from a very big list through applescript, the connection with the app
@@ -113,3 +108,10 @@ class CocoaHandler(logging.Handler):
 
 def install_cocoa_logger():
     logging.getLogger().addHandler(CocoaHandler())
+
+def patch_threaded_job_performer():
+    # _async_run, under cocoa, has to be run within an autorelease pool to prevent leaks.
+    # You only need this patch is you use one of CocoaProxy's function (which allocate objc
+    # structures) inside a threaded job.
+    from jobprogress.performer import ThreadedJobPerformer
+    ThreadedJobPerformer._async_run = autoreleasepool(ThreadedJobPerformer._async_run)

cocoalib/controllers/HSProgressWindow.h

@@ -17,10 +17,12 @@ http://www.hardcoded.net/licenses/bsd_license
     NSInteger progress;
     HSTextField *jobdescTextField;
     HSTextField *progressdescTextField;
+    NSWindow *parentWindow;
 }
 
 - (id)initWithPyRef:(PyObject *)aPyRef view:(NSView *)aView;
 - (PyProgressWindow *)model;
+- (void)setParentWindow:(NSWindow *)aParentWindow;
 
 - (void)setProgress:(NSInteger)aProgress;
 - (void)showWindow;

cocoalib/controllers/HSProgressWindow.m

@@ -17,6 +17,7 @@ http://www.hardcoded.net/licenses/bsd_license
     [[ProgressController mainProgressController] setWorker:self];
     jobdescTextField = [[HSTextField alloc] initWithPyRef:[[self model] jobdescTextField] view:[[ProgressController mainProgressController] descText]];
     progressdescTextField = [[HSTextField alloc] initWithPyRef:[[self model] progressdescTextField] view:[[ProgressController mainProgressController] statusText]];
+    parentWindow = nil;
     return self;
 }
 
@@ -26,6 +27,11 @@ http://www.hardcoded.net/licenses/bsd_license
 }       
 
 /* Public */
+- (void)setParentWindow:(NSWindow *)aParentWindow
+{
+    parentWindow = aParentWindow;
+}
+
 - (void)setProgress:(NSInteger)aProgress
 {
     progress = aProgress;
@@ -33,7 +39,12 @@ http://www.hardcoded.net/licenses/bsd_license
 
 - (void)showWindow
 {
-    [[ProgressController mainProgressController] show];
+    if (parentWindow != nil) {
+        [[ProgressController mainProgressController] showSheetForParent:parentWindow];
+    }
+    else {
+        [[ProgressController mainProgressController] show];
+    }
 }
 
 - (void)closeWindow