ensured that all displayed errors are also logged

src/main/java/amidst/gui/main/Actions.java

@@ -148,6 +148,7 @@ public class Actions {
 					viewerFacade.centerOn(player);
 				}
 			} else {
+				AmidstLogger.warn("There are no players in this world.");
 				mainWindow.displayError("There are no players in this world.");
 			}
 		}
@@ -212,13 +213,15 @@ public class Actions {
 			if (file != null) {
 				file = appendPNGFileExtensionIfNecessary(file);
 				if (file.exists() && !file.isFile()) {
-					mainWindow.displayError(
-							"Unable to write capture image, because the target exists but is not a file: "
-									+ file.getAbsolutePath());
+					String message = "Unable to write capture image, because the target exists but is not a file: "
+							+ file.getAbsolutePath();
+					AmidstLogger.warn(message);
+					mainWindow.displayError(message);
 				} else if (!canWriteToFile(file)) {
-					mainWindow.displayError(
-							"Unable to write capture image, because you have no writing permissions: "
-									+ file.getAbsolutePath());
+					String message = "Unable to write capture image, because you have no writing permissions: "
+							+ file.getAbsolutePath();
+					AmidstLogger.warn(message);
+					mainWindow.displayError(message);
 				} else if (!file.exists() || mainWindow.askToConfirm(
 						"Replace file?",
 						"File already exists. Do you want to replace it?\n" + file.getAbsolutePath() + "")) {

src/main/java/amidst/gui/main/MainWindow.java

@@ -292,8 +292,8 @@ public class MainWindow {
 	}
 
 	@CalledOnlyBy(AmidstThread.EDT)
-	public void displayException(Exception exception) {
-		AmidstMessageBox.displayError(frame, "Error", exception);
+	public void displayException(Exception e) {
+		AmidstMessageBox.displayError(frame, "Error", e);
 	}
 
 	@CalledOnlyBy(AmidstThread.EDT)

src/main/java/amidst/gui/main/UpdatePrompt.java

@@ -39,7 +39,7 @@ public class UpdatePrompt {
 				return new UpdatePrompt(
 						currentVersion,
 						workerExecutor,
-						exception -> mainWindow.displayException(exception),
+						e -> mainWindow.displayException(e),
 						() -> mainWindow.displayMessage(TITLE, NO_UPDATES_AVAILABLE),
 						message -> mainWindow.askToConfirm(TITLE, message));
 			}
@@ -55,7 +55,7 @@ public class UpdatePrompt {
 				return new UpdatePrompt(
 						currentVersion,
 						workerExecutor,
-						exception -> AmidstMessageBox.displayError(TITLE, exception),
+						e -> AmidstMessageBox.displayError(TITLE, e),
 						() -> AmidstMessageBox.displayInfo(TITLE, NO_UPDATES_AVAILABLE),
 						message -> askToConfirmDirectly(message));
 			}
@@ -102,13 +102,7 @@ public class UpdatePrompt {
 
 	@CalledOnlyBy(AmidstThread.EDT)
 	private void onCheckFailed(Exception e) {
-		AmidstLogger.warn("unable to check for updates");
-		displayError(e);
-	}
-
-	@CalledOnlyBy(AmidstThread.EDT)
-	private void displayError(Exception e) {
-		AmidstLogger.warn(e);
+		AmidstLogger.warn(e, "unable to check for updates");
 		exceptionConsumer.accept(e);
 	}
 
@@ -118,7 +112,8 @@ public class UpdatePrompt {
 			try {
 				openURL(new URI(updateInformation.getDownloadUrl()));
 			} catch (IOException | UnsupportedOperationException | URISyntaxException e) {
-				displayError(e);
+				AmidstLogger.warn(e);
+				exceptionConsumer.accept(e);
 			}
 		}
 	}
@@ -134,6 +129,7 @@ public class UpdatePrompt {
 		} else if (newVersion.isSameVersionButOldPreReleaseAndNewStable(currentVersion)) {
 			return askToConfirm(createMessage(message, newVersion, "stable"));
 		} else {
+			AmidstLogger.info(NO_UPDATES_AVAILABLE);
 			noUpdatesDisplayer.run();
 			return false;
 		}

src/main/java/amidst/gui/seedsearcher/SeedSearcherWindow.java

@@ -18,6 +18,7 @@ import amidst.documentation.AmidstThread;
 import amidst.documentation.CalledOnlyBy;
 import amidst.documentation.NotThreadSafe;
 import amidst.gui.main.MainWindow;
+import amidst.logging.AmidstLogger;
 import amidst.mojangapi.file.json.filter.WorldFilterJson_MatchAll;
 import amidst.mojangapi.world.WorldSeed;
 import amidst.mojangapi.world.WorldType;
@@ -111,6 +112,7 @@ public class SeedSearcherWindow {
 				WorldType worldType = seedSearcherConfiguration.getWorldType();
 				seedSearcher.search(seedSearcherConfiguration, worldSeed -> seedFound(worldSeed, worldType));
 			} else {
+				AmidstLogger.warn("invalid configuration");
 				mainWindow.displayError("invalid configuration");
 			}
 		}